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   Re: Again wit da AND and Repetitions

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  • From: Lars Marius Garshol <larsga@ifi.uio.no>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: 14 May 1999 09:03:17 +0200

* John Cowan
| IIRC the canonical way of doing (A & B & C) is to transform it into
| (A | B | C)* and then do a post-check that each of A, B, C appears
| exactly once.  As opposed to brute-force expansion into a DFA.

Hmmm. It sounds as if this could be extended to handle {n,m}A as well.
Just transform it into A+ (or *, depending on n) and do a post-check
that the number is correct.

In fact, this solution looks relatively easy to implement.

--Lars M.

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